Hollow rudder for ships



3 M. OERTZ 1,834,003

HOLLOW RUDDER FOR SHIPS d Ap ril s',- 1929 a Sheets-Sheet i Dec. 1, 1931. QERTZ 1,834,003

HOLLOW RUDDER FOR smrs Fiied April 8. 1929 3 She s-Sheet 2 l, 1931. M. OERTZ HOLLOWRUDDER FOR sans Filed April 8. 1929 'SSheets-Sheet 3 Patented Dec. 1 1931 UNITE-D;

mAx-g-onn'rz, or ramming- RM NY; Anne EMILIA onmannmmsmn'rnixo1" SAID MAX onncranncnnsnn, ASSIGNOR, BY MESNE ASSIGNMENTS;TQANNAEM1ILIA with screws which latter cannot bese'cured OERTZ, or HAMBURG, GERMANY -HoLLow nunnnnron SHIPS- Application filed Apri1,,8; 1929, swarm.

In streamline I rudders, which arecon; structed as hollow bodiesy and which; in gen eral, have a pivot at top; and bottom only, the

mounting and disinounting of the rudder e'nk tails difiiculties which hitherto could only be overcome bvintroducin'g Tcertain disadvantages in the constructionlof the rudder. Thus, p

in halv'es, can now be made in one piece,

for, example, in balanced streamline rudders which are pivotedto a pillarconnecting the upper part of the :stern post to the sole piece I of the stern frame the rudder bladehasto be opened up along its whole height after the rudder shaft, has been disconnected." Such a method of constructionhas, however, the

greatdisadvantagethat all the" detachable.

strips of plating can only be fixedin place by welding over their heads, as otl erwised-ismounting would be impossible without considerable trouble. Now-v1 experience shows 7 that theserivet screws may very easily work loose owin to the vibration set u I in'lthe screw race and hence therigidity of the rudder blade may be seriously impaired, especially as theseatof the insecurity is located just in the region of the greatestbending stress'on the rudder. Apart from the 'fact that a. rudder of this kind canonly be'kept watertightin' its after part, the screwing in" and 'out' of the rivet, screws entails consid erable laboury-especially ifithey have become rustedin after alon-gvoyage v p I I It is an object oft he present invention to provide a hollow streamline ruddero'f novel and improved construction such that the rigidity of the rudder in all its parts is' com- 'pletely assured, notwithstandingthe fact that. provision is made for easily and quickly mounting and dismounting such rudder According to one practical embod1mentof the invention the .gudgeon' p ns or pintles about whiohthe rudder rotates; canbelnoved, in upward and downward dlIGCtlOIiSISPGC- tively after the "cotters which hold. them in position have been knocked out. After the rudder shaft has been disconnectedthe rudder blade can then at once be removed rear-' wardly or sideways. c The socket hearings on which the rudder blade turnsfare'sunk into the corresponding cast steel parts whichi 353,538, and in gGerm any mm; 7 .1, {1929.

bound the rudder above and below, insuch a way that no-reduct1on of strength in the rudder body and, in generah' no diminution of the desired degreeof water-tightness can takeplace. The liners o-fthe bearings, which lar herein firstjnientioned, had to' be made which,

In; the accompanying drawings i ofcourse materially strengthens it;

when the rudder was constructed with th'epil V Figure-1 showsYin'sectiona'constructional form in whichthe sup-portingpintle j which has to take. the weight of the rudder, is arranged at the "hottom and whereinQtherefore, the cotter k {which holds the pintle' and also the castingb are kept correspondingly strong; Ifthe' rudder be worked in a watertight condition," as 'inmost cases it will be,

the supporting pintle 7 will be relieved of end thrust by the, upward thrust of the rudder blade;

j Figure 2 shows a practical constructional form in longitudinal section and Figure 3 the same in transverse section both I sections being drawn to anenlarged scale and taken onthe line XX of Figure 1.]

p Figuresfl and v 5 are viewssimilar, respec@ tively to Figures 2 and ,3j and show the con-- struction of the lower pintle. .-Here also'the sections are takenon the line X X of Figure land the figures drawn 'to an enlarged scale.- Figures 3 and 5, in'pa'rticular, show the manner in'which the cotters secure the pintles.

Figure 6 showsdiagra-mm'atically an example of a cross sectional iformjo'f rudder,

blade. 1

and bottom by cast steel members Z'J'in which "are inserted the linersof the sooketbearings for the pintles f whichyin their'qtu'rn, are held in place by the 'cotters'k: It will'be seen 5 that when these cotters havebeen'withdrawn,

The rudder' body a is bounded a the top the 'pin'tles' can be easily removed inupward,

and downward? directions respectively (con- 5,

5 the; rudder. is then -fiee' to be unshippedafter the rudder shaft "has been disconnected froin the rudder body e." The mountingof the rudderis effected'by-ecarrying out exactly "the sam'efoperations' in reverseorderr-f r 3 venienuy wan-(the hel er the? eye: d) r and Figures 7 to in which the same reference letters areemployed for like parts, show a form of construction in which the supporting pintle is arranged in theupper half of the rudder.

F igure7 shows a section of this construetional form Which will be understood without furthergcx'planation. 1

5-F1gure 81s an enlarged section X-X of Figure 7 Figurei) is transverse section on the line XX of Figure 7 at the part where the sup-..

porting gudgeon and pintle are located.

FigureslO and 11 show longitudinal and transversesections, respectively, through the lower part of the'rudder, on an enlarged scale. Figure 12 shows a tool with the aid of wliichtlie pintle can easily be startedfrom its conical seating. After removing. the cotter lcand inserting thisto'ol'a blowis delivered thereon in the direction indicated by the arrow, the pintle being therebynnseated, so

, thatitcan easily b'ejdrawn out,jsay by a pull on the eyed. v i

Figure 13 shows} an example of a 'cros's'sectionfor this form of rudder.

. Figuresl t, to 17 'showthe second form of 7 construction. in accordance with the invention. Here, the pintles are not removable so but thei part-s of the. rudder Whichare intended for the reception of the pintles are each'provided with a bearing one halfot whichv is removablefl I Figure 14 is a lon itudinal section, and

Figures 15 and 1? are sections on the line X of the upper and lower sidesrespectively, these sect-ionsbeing drawn to a larger Figure 16 shows, also on an enlargedscale, 40

a horizontal. section on the line A B of Figure 1d.

,Therudderbody a isbounded at the top and-bottom' cast- "steel members in each otwhich theihalf p of the bearing through ,which; the bolts qcan be'screwed is fitted. L In thecase illustrated a thrust ringris'provided t'o take theweight lot the rudder but .thisring' may be dispensed with it the usual type. of pintle with a thrust pan as shown in v surface on thejrudder. V 1-,. ;;ln the present specification constructional 1 examples-areshownand described for balv janced: rudders only but itis: to be understood 31112111 11 n ent en s n eit ;1f n-i se ppl cation eitherto'balan'ced rudders-or to 'rud-- 7 Figure 4 be employed. In like manner a thrust-ring may. obviously also be provided instead of usingthe supporting pintlesshown *in-EFi gures1to13. The holes roundthenut's 1 andheads of the bolts 9 may, if ne'cessary,be

,filled in withcement so as to obtain a smooth on the line if idayofMarch,1929.j 1 MAX OERTZ.'

pintle holding gudgeons, removable pintles adapted to penetrate the gudgeons an'd the pintle receiving cavities and means for locking the pintles in the gudgeons.

2'. In a dismountableshipsrudder assembly, a li ol'low watertight rudder structure 7 comprising upper 'and'lower stifiening members each with a pintle receiving cavity and fixed plating extending between said members to. enclose therewith the hollow water tight space,'a' stern frame with pintle holding gudgeons, removablepintles adapted to penetrate the gudgeons and the pintle receiving cavities and means for locking the pintles in'the gudgeons. f

3; A ships rudder comprising a hollow body; the top'and bottom walls of the hollow bodyhaving a certain thickening or 'stifieningportion, outwardly opening recesses in said thickened portions, finger bolts detachably secured in's'aid recesses for connecting said rudder directly to the rudder stem, said detachable finger bolt connections in the rec esses in the top'iand bottom walls ofthe body of the rudder, ,while being disposed within thesphere of the hollow rudder body,

are readily accessible'for attachment and detachment independently of the plating of the rudder. V, V i j 4. A hollow rudder according to claim 3 and so constructed as toshut ofi' watertight the said finger bolt connections from the interior of the hollow rudder body.

'5 In combination with -a' hollow rudder according to claim 3, said finger bolts, when the rudder ismounted, being removable from the rudder and fromth'e rudder stem, the 1 lower bolt downwardly,th e upper bolt upwardly,s'aid finger bolts having a lateral opening,;and akey for cooperatingwith said opening to retain the belts in operative posivtion'in the stemysaid key being removed to remove the bolts.

Signed at Hamburg, Germany, this 26th I'dersiof streamline contour. The invention is V applicable to all hollowrudders and thus also to rudder'structures made in two parts ffor instance, to the Oertz rudder and to other 

